Spiritual reasons. It's rumored they calcify an area of the brain known as the "Pineal Gland." In-depth research is lacking though, I have to admit. Better safe than sorry, in those regards.

More than just Gluten, most grains contain Phytates and Lectins, both of which are undeniably detrimental to the human system.

I don't think that necessarily all grains are bad. Whole grains, for example, certainly look less worse than processed grains, stripped of their nutrients. I guess if you're a well nourished healthy individual it is not so bad. But, overall, I think it docs time from your life. I still consume them though. What's life if you don't risk it?

Are folks in Australia really not concerned about this kind of stuff? You're considering NOT getting involved?
I live in Arkansas, US. In this part of the States, it'd be almost customary for your girlfriend to immediately start beatin' that ass... At the very least tell your brother. Like, wtf could it hurt? She'll be pissed for a time, but mostly out of humiliation. And that humiliation is much less than what she could be setting herself up for...

Don't consume soy milk. Soy isoflavone promotes "Aromatization", the process by which testosterone is converted into estrogen. It creates crazy hormone imbalances. Abnormally high estrogen levels, and low testosterone levels are in part responsible for obesity and a host of issues found today.

Even the people who train calves train them the wrong way. I see guys on the seated calf machine doing only 315lbs. That's only 157.5lbs per calf meaning that, unless you weigh less than 157.5lbs, the calf raise is a less intense workout (at 315lbs) than walking (because you do a full bodyweight calf raise for EACH calf when you step.)
Arnold talks about it in his book "Education of a Bodybuilder." He says his calves were lacking for a long time until he met Reg Park who had been calf raising 1,000lbs. Arnold quickly jumped up to 500lbs before competition and won his first Mr. Olympia title.

Trust me, with the nature of our work we came to know each other far more than you could imagine in three months. Now, granted, that isn't to say I do know her perfectly. But I know her well enough. Hell, I don't even know myself half the time, so what's it matter? Just wondering why she would do something so out of place. I know it as a fact that what she is doing lately is not the norm, and not the norm for her. It is definitely awkward and I'm simply wanting to know why her behavior is sticking out like a sore thumb as of late.